Move kernel baseline tests to front_end.

pkg/front_end/testcases/store_load.dart.outline.expect

 library;
 import self as self;
 import "dart:core" as core;
 
-class G<T extends core::Object> extends core::Object {
+class Foo extends core::Object {
+  field dynamic _field;
   constructor •() → void
     ;
 }
-class A extends core::Object {
+class FooValue extends core::Object {
   constructor •() → void
     ;
 }
-class B extends self::A {
+class Bar extends core::Object {
+  field dynamic _field;
   constructor •() → void
     ;
 }
-class C extends self::B {
+class BarValue extends core::Object {
   constructor •() → void
     ;
 }
 static method main() → dynamic
   ;